Morning: Small Business Tax Tips (New Haven)

New Haven, Connecticut : Jose’s Tax Service : August 31, 2026

For New Haven small business owners, September 15, 2026, is the third-quarter estimated tax deadline for the 2026 tax year. The deadline applies to many self-employed individuals, independent contractors, freelancers, landlords, investors, and business owners whose income is not fully covered by payroll withholding.

Estimated tax planning is a pay-as-you-go requirement. Tax is generally paid as income is received. If insufficient tax is paid during the year, an underpayment penalty may apply. A balance due at filing does not automatically mean a penalty. However, late or inadequate quarterly payments can increase the amount owed.

Use the following process to review your federal and Connecticut obligations before the Q3 deadline.

1. Determine Whether Estimated Tax Applies!

Estimated tax may apply when income is received without sufficient federal or state withholding. Common examples include:

• Schedule C income from a sole proprietorship.
• Independent contractor or gig-economy income.
• Partnership or S corporation income reported on Schedule K-1.
• Rental or royalty income.
• Interest, dividends, and capital gains.
• Pension or retirement income without adequate withholding.
• Any combination of income sources that creates a tax balance.

For federal purposes, individuals generally should make estimated payments when they expect to owe at least $1,000 after withholding and refundable credits when filing the annual return. Special rules may apply to farmers, fishers, estates, trusts, corporations, and certain pass-through entities.

The standard federal payment schedule for calendar-year individual taxpayers is:

1. April 15, 2026 : first installment.
2. June 15, 2026 : second installment.
3. September 15, 2026 : third installment.
4. January 15, 2027 : fourth installment.

The September installment generally relates to income received from June 1 through August 31. Review your year-to-date income now. Do not wait until the annual return is prepared.

For additional guidance, review the IRS estimated tax information for small businesses and self-employed individuals.

2. Apply the Federal Safe-Harbor Rules!

The federal estimated tax safe harbor is designed to limit or eliminate an underpayment penalty when sufficient payments are made on time. In general, your total federal withholding and timely estimated payments should equal at least the smaller of:

• 90% of your 2026 tax, or
• 100% of your 2025 tax.

If your adjusted gross income (AGI) for 2025 exceeds $150,000, use 110% of your 2025 tax instead of 100%. The threshold is generally $75,000 for married taxpayers filing separately.

The comparison is made against the applicable tax shown on the return. Withholding is included in the calculation. This is important for business owners who also receive wages from another job or from a spouse’s employment.

Use this simplified review:

1. Locate Form 1040, U.S. Individual Income Tax Return, for 2025.
2. Identify your 2025 total tax.
3. Multiply the prior-year amount by 1.00 or 1.10, depending on your prior-year AGI and filing status.
4. Compare that amount with 90% of your projected 2026 tax.
5. Use the lower applicable amount as the federal annual safe-harbor target.
6. Subtract expected 2026 federal withholding.
7. Divide the remaining amount among the applicable payment periods.

A safe harbor does not necessarily reduce your final tax liability. It addresses the estimated-tax penalty. You may still owe additional tax when the 2026 return is filed.

3. Understand Form 2210!

Form 2210, Underpayment of Estimated Tax by Individuals, Estates and Trusts, is used to determine whether an estimated tax penalty applies and, when necessary, to calculate the penalty.

Form 2210 may be relevant when:

• Your withholding and estimated payments do not satisfy a safe harbor.
• One or more quarterly payments were late.
• Payments were not made in the required amounts.
• Your income changed significantly during the year.
• Your income was earned unevenly across the year.
• You qualify for an exception or penalty waiver.

Do not assume that a late-year payment fully corrects an earlier shortfall. The IRS generally evaluates underpayments by installment period. A later payment may not eliminate interest or penalty attributable to an earlier missed installment.

If your income is seasonal or irregular, review Form 2210, Schedule AI, Annualized Income Installment Method. This method may align required payments with the period in which income was actually earned. It can be useful for contractors, retailers, consultants, and other businesses with uneven revenue.

Farmers and fishers may have different rules. Those taxpayers should review Form 2210-F, Underpayment of Estimated Tax by Farmers and Fishermen.

Review the official IRS information about Form 2210 before filing. Use the current form and instructions for the applicable tax year.

4. Calculate and Pay the Federal Q3 Installment!

Use Form 1040-ES, Estimated Tax for Individuals, to calculate and pay federal estimated tax. The form includes an estimated tax worksheet and payment vouchers.

Complete the federal review in this order:

1. Estimate your 2026 business income through December 31.
2. Subtract ordinary and necessary business expenses that are properly documented.
3. Include self-employment tax, income tax, credits, deductions, and other taxable income.
4. Add federal withholding from Forms W-2 and other sources.
5. Include federal estimated payments already made for Q1 and Q2.
6. Calculate the remaining amount needed for the selected safe harbor.
7. Confirm the Q3 payment amount.
8. Schedule or submit the payment by September 15, 2026.

You can pay federal estimated tax through:

• IRS Direct Pay. This option allows payment directly from a bank account. It is free and generally does not require an account sign-in.
• EFTPS, the Electronic Federal Tax Payment System. Existing users can schedule payments and retain confirmation records.
• A mailed payment using the appropriate Form 1040-ES payment voucher. Follow the current IRS mailing instructions.

Select the correct tax year and payment type. Designate the transaction as a 2026 estimated tax payment. Save the confirmation number, payment date, amount, and bank account information.

Do not confuse an estimated payment with a balance-due payment for a prior-year return. Incorrect designations can delay posting or misapply the payment.

5. Make the Connecticut Payment Separately!

Federal and Connecticut estimated tax payments are separate obligations. A federal payment does not satisfy Connecticut income tax requirements.

Connecticut residents and individuals with Connecticut-source income may need to file Form CT-1040ES, 2026 Estimated Connecticut Income Tax Payment Coupon for Individuals. The form is used to calculate and pay Connecticut estimated income tax.

Connecticut estimated payments for the 2026 tax year are generally due on:

• April 15, 2026.
• June 15, 2026.
• September 15, 2026.
• January 15, 2027.

Connecticut’s required annual payment is generally based on the lesser of 90% of the current-year Connecticut tax or 100% of the prior-year Connecticut tax, subject to the applicable instructions and taxpayer circumstances. Connecticut rules also account for withholding and eligible Pass-Through Entity Tax (PE Tax) Credits.

Calculate the state obligation independently. Consider Connecticut-source income, resident or nonresident status, business activity conducted in Connecticut, withholding, tax credits, and prior-year liability.

You can pay Connecticut estimated tax electronically through myconneCT. You may also follow the payment instructions included with Form CT-1040ES.

Retain the state confirmation separately from the federal confirmation. A state payment should not be entered as a federal estimated payment.

6. Maintain Complete Records!

Estimated tax planning depends on reliable records. Maintain a quarterly tax file that includes:

• Gross receipts and sales reports.
• Bank and payment processor statements.
• Business expense documentation.
• Mileage and vehicle-use records.
• Payroll and withholding records.
• Forms 1099-NEC, 1099-K, 1099-INT, and 1099-DIV.
• Prior-year federal and Connecticut returns.
• Copies of Forms 1040-ES and CT-1040ES.
• IRS Direct Pay or EFTPS confirmation numbers.
• myconneCT payment confirmations.
• Calculations supporting income, deductions, credits, and withholding.
• Communications regarding payment adjustments or tax planning decisions.

Reconcile business bank accounts monthly. Separate personal and business transactions. Categorize expenses consistently. Missing documentation can weaken a deduction and may lead to additional tax, penalties, or processing delays.

Review your estimate again after September 30. Update the Q4 payment when revenue, expenses, payroll, or ownership distributions change.

7. Obtain a Personalized Q3 Review!

A precise estimated tax payment requires more than dividing last year’s tax by four. Your result may depend on current income, deductions, credits, self-employment tax, withholding, prior payments, Connecticut-source income, and the timing of revenue.

Jose’s Tax Service provides personalized tax preparation and year-round tax planning for New Haven individuals and small business owners. Support is available for self-employment income, business deductions, federal and Connecticut filing, bookkeeping, and quarterly payment planning.

Schedule a consultation online or contact Jose’s Tax Service. Virtual and in-person appointments are available. Same-day scheduling may be available.

Practical reminder: Complete your federal and Connecticut Q3 estimated tax review now. Submit each payment by September 15, 2026. Save every confirmation. Use current IRS and Connecticut Department of Revenue Services instructions.

Category: Tax Planning | Tags: small business tax, New Haven business, deductions, tax strategy